2. a) Give the definition of,a stationary time series Y. b) Let (Z.) be a sequence of independent starrlard normal variables (1.e, having mearw O and varl- ance 1). Show that the time series (Y)so defined by Yo Zo and Y - Y,- 22+ (t2 0) in not stationary.

Q: Write any 3 formulas for sum of squares terms.

A:

Q: 2 +,

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A: Given that       4x - 5y = 3 -------------(1)        3x - 4y = 6 -------------(2)

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Q: find domain

A: If you have any questions let me know in comment box thankyou for your question.

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A:

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A: order of (Z4, +4) for each element

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A: See attached file for a step by step explanation.

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